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Method for preparing superfine spherical iron nitride powder

A technology of iron nitride and spherical shape, which is applied in the direction of nitrogen-metal/silicon/boron binary compounds, etc., can solve the problems of poor stability, complicated process, and low powder sphericity, and achieve high saturation magnetization, fine and uniform particle size, Reduces the effect of oxidation problems

Inactive Publication Date: 2010-11-24
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] The above-mentioned methods generally have problems such as strict preparation conditions, complicated process, and lengthy process flow, which lead to high manufacturing cost of iron nitride ultrafine powder, and the prepared powder has low sphericity, which makes the magnetic powder form magnetic fluid or magnetic flow. Poor stability when changing liquid, which affects the development and application of iron nitride powder

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  • Method for preparing superfine spherical iron nitride powder
  • Method for preparing superfine spherical iron nitride powder

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example 1

[0020] Example 1: Preparation of ultrafine spherical iron nitride powder with an average particle diameter of 150nm

[0021] Using carbonyl iron liquid and ammonia gas as raw materials, the stable radio frequency (RF) plasma power is 60KW, the flow rate of argon working gas is 45 slpm, the flow rate of argon protective gas is 150 slpm, and the system negative pressure is 220 mm Hg. Send carbonyl iron liquid vapor with a flow rate of 5 slpm and ammonia gas with a flow rate of 30 slpm into the high-temperature plasma. The carbonyl iron liquid vapor is decomposed and nitrogen ions are nitrided to form iron nitride powder, which is collected to obtain ultrafine spherical particles with an average particle size of 150 nm. Iron nitride powder.

example 2

[0022] Example 2: Preparation of ultrafine spherical iron nitride powder with an average particle size of 50nm

[0023] Using carbonyl iron liquid and ammonia as raw materials, the stable radio frequency (RF) plasma power is 55KW, the flow rate of argon working gas is 30 slpm, the flow rate of argon protective gas is 150 slpm, and the system negative pressure is 200 mm Hg. Send carbonyl iron liquid vapor with a flow rate of 3 slpm and ammonia gas with a flow rate of 40 slpm into the high-temperature plasma. The carbonyl iron liquid vapor is decomposed and nitrogen ions are nitrided to form iron nitride powder, which is collected to obtain ultrafine spherical particles with an average particle size of 50 nm. Iron nitride powder.

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Abstract

The invention provides a method for preparing superfine spherical iron nitride powder, and belongs to the technical field of powder preparation. In the method, the superfine spherical iron nitride powder is synthesized and prepared by taking carbonyl iron liquid as a raw material, ammonia (or nitrogen) plasma as nitridation atmosphere and radio frequency (RF) plasma as a heat source for the reaction. The method comprises the following steps of: evaporating the carbonyl iron liquid; feeding the liquid steam into the nitrogen plasma by carrier gas; and reacting decomposed carbonyl iron steam with the nitrogen plasma to obtain the superfine spherical iron nitride powder. The method is characterized in that the nitridation and spheroidization of the carbonyl iron liquid steam are finished in one step by taking the radio frequency (RF) plasma as the heat source so as to prepare the superfine spherical iron nitride powder. The superfine spherical iron nitride powder produced by the method has fine and uniform particle size, high sphericity and high spheroidization rate; the process is simple; and magnetic fluid prepared by the method has high saturation magnetization.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, and in particular provides a preparation method of ultrafine spherical iron nitride powder. technical background [0002] Iron Nitride (Fe x N) Magnetic powder is a new type of strong magnetic material, which has special and multi-faceted application value in the fields of electronic industry, chemical industry and national defense high-tech research. Compared with the commonly used magnetic recording material γ-Fe 2 o 3 In comparison, iron nitride magnetic powder has the characteristics of high recording density, high signal-to-noise ratio, good corrosion resistance and oxidation resistance, so the development of iron nitride magnetic powder has been extensively studied. [0003] The results of literature search at home and abroad show that the current preparation methods of iron nitride magnetic powder mainly include α-FeOOH reduction nitriding method, Fe(CO) 5 Nitriding method, ...

Claims

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Application Information

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IPC IPC(8): C01B21/06
Inventor 邵慧萍盛艳伟郭志猛林涛王述超
Owner UNIV OF SCI & TECH BEIJING
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